Very difficult sudoku #816
| 6 | 4 | |||||||
| 8 | ||||||||
| 8 | 4 | 3 | 5 | |||||
| 8 | 3 | 2 | ||||||
| 5 | 7 | |||||||
| 7 | 1 | 2 | ||||||
| 8 | 7 | 4 | ||||||
| 7 | 6 | 2 | 5 | |||||
| 6 | 1 |
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